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DISCONTINUED OPERATIONS - Financial Results of Instaff (Details) - USD ($) | 3 Months Ended
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Mar. 27, 2022 | Mar. 28, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Income from operations of discontinued operations before taxes | $ 1,234,996 | $ 1,155,670
Instaff | Discontinued Operations, Held-for-sale |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Revenue | 16,465,067,000 | 17,961,498,000
Cost of services | 14,143,775,000 | 15,361,476,000
Gross profit | 2,321,292,000 | 2,600,022,000
Selling expenses | 1,062,044,000 | 1,420,920,000
Depreciation | 24,252,000 | 23,432,000
Income from operations of discontinued operations before taxes | $ 1,234,996,000 | $ 1,155,670,000

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